English verb conjugation
MUST BILLOW

Regular verb: billow - billowed - billowed

Affirmation

Simple form	V-ing form
I must billow you must billow she must billow we must billow you must billow they must billow	I must be billowing you must be billowing she must be billowing we must be billowing you must be billowing they must be billowing
Perfect	V-ing perfect
I must have billowed you must have billowed she must have billowed we must have billowed you must have billowed they must have billowed	I must have been billowing you must have been billowing she must have been billowing we must have been billowing you must have been billowing they must have been billowing

Negation

Simple form	V-ing form
I mustn't billow you mustn't billow she mustn't billow we mustn't billow you mustn't billow they mustn't billow	I mustn't be billowing you mustn't be billowing she mustn't be billowing we mustn't be billowing you mustn't be billowing they mustn't be billowing
Perfect	V-ing perfect
I mustn't have billowed you mustn't have billowed she mustn't have billowed we mustn't have billowed you mustn't have billowed they mustn't have billowed	I mustn't have been billowing you mustn't have been billowing she mustn't have been billowing we mustn't have been billowing you mustn't have been billowing they mustn't have been billowing

Interrogative form

Simple form	V-ing form
must I billow? must you billow? must she billow? must we billow? must you billow? must they billow?	must I be billowing? must you be billowing? must she be billowing? must we be billowing? must you be billowing? must they be billowing?
Perfect	V-ing perfect
must I have billowed? must you have billowed? must she have billowed? must we have billowed? must you have billowed? must they have billowed?	must I have been billowing? must you have been billowing? must she have been billowing? must we have been billowing? must you have been billowing? must they have been billowing?

Interro-negative form

Simple form	V-ing form
mustn't I billow? mustn't you billow? mustn't she billow? mustn't we billow? mustn't you billow? mustn't they billow?	mustn't I be billowing? mustn't you be billowing? mustn't she be billowing? mustn't we be billowing? mustn't you be billowing? mustn't they be billowing?
Perfect	V-ing perfect
mustn't I have billowed? mustn't you have billowed? mustn't she have billowed? mustn't we have billowed? mustn't you have billowed? mustn't they have billowed?	mustn't I have been billowing? mustn't you have been billowing? mustn't she have been billowing? mustn't we have been billowing? mustn't you have been billowing? mustn't they have been billowing?